The reason that quilting seems to be done by "old" ladies/gentlemen is because - - the current culture stifles traditional anything.
So, if you would like young people to quilt with, start offering classes to young people .... like-minded people will join you.
I have to admit - - if I had ever taken up quilting in 1976 when it enjoyed a revival because of the bi-centennial, I probably would not be quilting today ... 1976 was before rotary cutters, great hints and tips, so many ways to connect with others. It was a time when the quilters who came into quilting could truly be considered pioneers because they were going into a craft that had almost died! At a time before copy machines, plastic templates, books by the HUNDREDS ...
Think back to why you are in your twenties and quilting ... think about what you like about it ... and use those things to identify your next quilting buddy, because you are not alone ... either in your gender, your town, your age group, or your thinking ... sometimes, we sort of have to go looking for the treasures that are inches away from us ... of course, as in all things ... we have to make others WANT to explore the idea. Being an example for others is a fact of life, no matter the endeavor.